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Control methods: increase the application of decomposed human excrement, cake fertilizer, manure or ammonium sulfate, urea, ammonium nitrate and other fertilizers.
2, phosphorus deficiency: the leaves turn from dark green to purple green, the veins (especially the petiole) are yellow with purple. Flower bud formation is difficult, flowering is small and less, and the color is light, resulting in poor fruit development, even withered and withered early.
Control methods: increase the application of bone meal, fish meal, poultry fertilizer or superphosphate, ammonium phosphate, potassium phosphate (for phosphorus, potassium compound fertilizer), generally with 0.10% aqueous solution for root dressing.
3, lack of potassium: the plant is short, the stem is soft and easy to fall. The leaves often shrink, and the old leaves appear dark brown spots along the leaves along the leaves, yellowing around the leaves, while the middle and veins are still green.
Control methods: increase the application of plant ash, 1% - 2% potassium chloride aqueous solution (contained by bulbs and roots), 0.30% - 0.5% of potassium nitrate aqueous solution outside the top dressing, with inorganic fertilizer such as potassium phosphate.
4. Calcium deficiency: The young leaves are green and shrinking. The leaves are rolled up and have white stripes. The flowers are blocked and difficult to spread or twisted.
Control method: Applying an appropriate amount of calcium chloride in the soil in the first half of the sowing or basin, can play the role of calcium and disinfection (his acid flower is not allowed) can also be used as top dressing with calcium nitrate.
5. Magnesium deficiency: Plant growth is not strong. The old leaves gradually turn green from the leaf edge to the center from the bottom to the center, and various spots appear on the veins, and finally the whole leaves turn yellow.
Control method: continuously spray 3-4 times with 0.20%-0.40% magnesium sulfate aqueous solution, each interval 7-10 days. The soil with severe magnesium deficiency is mixed with 5-10 kg of magnesium sulfate per acre and mixed into the base fertilizer in autumn or winter.
6. Sulfur deficiency: The young leaves begin to yellow from the veins, and finally until the whole leaves are yellow, the roots are not normal.
7, iron deficiency: from the young leaves to the old leaves yellow.
Sulphur-deficient and iron-deficient prevention and treatment methods: Spraying with 0.30% ferrous sulfate aqueous solution for 3 consecutive times, one time interval, the spray point should be fine and uniform. At the same time, the root dressing can be carried out with 0.20% urea iron aqueous solution.
Judgment and prevention of flower nutrient deficiency
1. Hypoxia: The plants are thin, the branches are slender and hard, and the leaves are small. The color of the leaves from the old leaves to the new leaves is dark and faint, followed by reddish purple until the atrophy falls off. In severe cases, the whole plant loses green.
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